HD6432621 Hitachi, HD6432621 Datasheet - Page 116

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

2.9.5
The external address space is accessed with an 8-bit or 16-bit data bus width in a two-state or
three-state bus cycle. In three-state access, wait states can be inserted. For further details, refer to
section 7, Bus Controller.
2.10
2.10.1
Only register ER0, ER1, ER4, or ER5 should be used when using the TAS instruction. The TAS
instruction is not generated by the Hitachi H8S and H8/300 series C/C++ compilers. If the TAS
instruction is used as a user-defined intrinsic function, ensure that only register ER0, ER1, ER4, or
ER5 is used.
72
External Address Space Access Timing
Usage Note
TAS Instruction
ø
Address bus
AS
RD
HWR, LWR
Data bus
Figure 2-23 Pin States in On-Chip HCAN Module Access
T1
High-impedance state
T2
Bus cycle
Retained
High
High
High
T3
T4